55505500505550 has 72 divisors (see below), whose sum is σ = 149655471526080. Its totient is φ = 14748792508800.

The previous prime is 55505500505519. The next prime is 55505500505557. The reversal of 55505500505550 is 5550500550555.

It is a super-2 number, since 2×55505500505550² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55505500505496 and 55505500505505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55505500505557) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 219349630 + ... + 219602529.

It is an arithmetic number, because the mean of its divisors is an integer number (2078548215640).

Almost surely, 2^{55505500505550} is an apocalyptic number.

55505500505550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55505500505550 is an abundant number, since it is smaller than the sum of its proper divisors (94149971020530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55505500505550 is a wasteful number, since it uses less digits than its factorization.

55505500505550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438952458 (or 438952450 counting only the distinct ones).

The product of its (nonzero) digits is 1953125, while the sum is 45.

The spelling of 55505500505550 in words is "fifty-five trillion, five hundred five billion, five hundred million, five hundred five thousand, five hundred fifty".